Effect of temperature on formability of glass mat reinforced thermoplastic sheets with ductile dummy sheets

Given the increasing use of glass mat-reinforced thermoplastic(GMT)composites,the formability of GMT sheets is currently a topic of research.A new sheet forming process for solidified GMT was developed.In this process,a GMT sheet was sandwiched by dummy metallic sheets during deep drawing.The dummy metallic sheets acted as protective materials and media for heating the GMT sheet.In this study,tensile tests of GMT specimens were carried out under different temperature conditions.The effect of temperature on the tensile deformation was analyzed.The effect of temperature on the deep drawing process of GMT sheets with dummy sheets was further investigated.Finite element method(FEM)was conducted to simulate the deep drawing process.In the drawing force rising stage,the law of drawing force with the depth of the drawing was analyzed using FEM and experiments.

能量桩研究现状与发展动态分析

能量桩是一种将地源热泵技术和传统桩基相结合的新型桩基。与传统桩基不同,能量桩工作时需同时承担上部建筑荷载和桩体温度变化的影响。目前,国内外学者对于桩体温度变化对能量桩工作特性影响的研究主要集中在温度对能量桩承载特性的影响和对桩土接触面力学特性的影响两个方面。在前人研究的基础上对能量桩的研究现状进行综合阐述,并提出能量桩的未来研究方向。